While Sony and Microsoft have spent most part of the year trying to appeal to gamers to upgrade to their latest generation consoles in the form of price cuts, promotions and exclusive titles, Nintendo has been rather conservative in this sense. The Wii has been selling way better than anybody expected plus the price for the console itself was set low from the very beginning compared to its competitors.
For this reason and for the fact that Nintendo has barely being able to keep up with demand - which is in part their fault - Nintendo officials have confirmed what everybody expected already, the Wii won't get a price cut for the holidays.
On a related note, Nintendo's highly anticipated hit Super Smash Bros. Brawl has been delayed and set back for a February release. Before this announcement the game was expected to come out by the end of the year and boost Wii sales. It is unlikely this will affect the high demand for the family-oriented console however.